We told a local customer that he could take delivery of this grapple in 3 weeks after product testing, but he started calling us every day wanting it sooner. Finally, we just let him have it, intending to make another for testing.
Since he was local, we knew we could fix any problems that may arise. The customer installed it on his tractor, and bent a cylinder in less than 10 minutes.
We were expecting to see abuse, but the grapple had no signs of even being used. We installed a new cylinder and hooked it to our new
L6060 Kubota.
The customer came along with us to some property located a few blocks away from work to unleash the fury and see if the cylinder or grapple would fail.
The customer returned home with his grapple, satisfied that it must have been a bad cylinder.....but......he bent another in less than 10 minutes. We then figured out that the aux. valve installed by his dealer was plumbed wrong.
The pressure line from the pump was going straight to the aux. valve with no relief, resulting in tremendous, infinite pressure until something breaks... pump, line, valve, cylinders. It should have been plumbed to the power beyond, which has pressure relief built in via the loader valve.
His dealer is coming out today to re-plumb the valve correctly.